PART - 3 CH - 9 Light-Reflection and Eefraction — Science STD 10 — Question

In comparing two media, the one with the higher refractive index is said to be optically denser than the other. The other medium of lower refractive index is said to be optically rarer than the first one.
→ The speed of light is higher in an optically rarer medium than in an optically denser medium.
→A ray of light travelling obliquely from an optically rarer medium to an optically denser medium slows down and bends towards the normal at the point of incidence. While, when it travels from an optically denser medium to an optically rarer medium. It speeds up and bends away from the normal at the point of incidence.